Hello TUMAAJKAL,
To Send data from form1 GridView to Textbox on form2 on button click, perform the following step:
1.) In form1, on buttonClick event:
string Name = GridView1.Rows[0].Cells[0].Text;
Response.Redirect("Form2.aspx?Name="+ Name );
2.) Now get Name variable to Textbox on form2. In Form2 Page_Load() event write following code:
TextBox1.Text = Request.QueryString["Name"];
i hope you will get your right result from this answer, and dont forget to accept this solution.... thank you.